STRUCTURAL CHANGES OF THE CARPAL TUNNEL, MEDIAN NERVE AND FLEXOR TENDONS IN MRI BEFORE AND AFTER ENDOSCOPIC CARPAL TUNNEL RELEASE

Hand Surgery ◽  
2014 ◽  
Vol 19 (02) ◽  
pp. 193-198 ◽  
Author(s):  
Toshimitsu Momose ◽  
Shigeharu Uchiyama ◽  
Seneki Kobayashi ◽  
Hiroyuki Nakagawa ◽  
Hiroyuki Kato
Keyword(s):  
Median Nerve ◽  
Carpal Tunnel ◽  
Structural Changes ◽  
Carpal Tunnel Release ◽  
Carpal Bone ◽  
Cross Sectional ◽  
Flexor Tendons ◽  
Endoscopic Carpal Tunnel Release ◽  
Before And After ◽  
Magnetic Resonance Imaging Mri

The purpose of this study is to investigate the structural changes of the carpal tunnel, median nerve, and flexor tendons in magnetic resonance imaging (MRI) before and after endoscopic carpal tunnel release (ECTR). We studied 36 hands undergoing ECTR. In MRI, the cross-sectional area of the carpal tunnel and the median nerve at the hamate and the pisiform levels were measured. The distance from the volar side of carpal bone to the median nerve or tendons and the volar displacement were measured. In post-operative MRI, the transverse carpal ligament could not be well delineated and the carpal tunnel was significantly enlarged both at the hamate and pisiform levels. The median nerve was enlarged at the hamate level. The median nerve and flexor tendons significantly moved to the volar side. The volar displacement of the median nerve and flexor digitorum superficialis in the long and ring fingers was greater than the other tendons.

scholarly journals Supraretinacular endoscopic carpal tunnel release: A safe alternative method for treatment of carpal tunnel syndrome

2021 ◽  
Vol 29 (1) ◽  
pp. 230949902199340
Author(s):  
Kotaro Sato ◽  
Kenya Murakami ◽  
Yoshikuni Mimata ◽  
Gaku Takahashi ◽  
Minoru Doita
Keyword(s):  
Learning Curve ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Open Surgery ◽  
Carpal Tunnel Release ◽  
Safe Alternative ◽  
Endoscopic Carpal Tunnel Release ◽  
Flexor Retinaculum ◽  
Carpal Tunnel Surgery ◽  
Conversion Rates

Purpose: Supraretinacular endoscopic carpal tunnel release (SRECTR) is a technique in which an endoscope is inserted superficial to the flexor retinaculum through a subcutaneous tunnel. The benefits of this method include a clear view for the surgeon and absence of median nerve compression. Surgeons can operate with a familiar view of the flexor retinaculum and median nerve downward, similar to open surgery. This study aimed to investigate the learning curve for SRECTR, an alternate method for carpal tunnel release, and evaluate its complications and the functional outcomes using a disposable commercial kit. Methods: We examined the open conversion rates and complications associated with SRECTR in 200 consecutive patients performed by two surgeons. We compared the operative time operated by a single surgeon. We evaluated outcomes in 191 patients according to Kelly’s grading system. Patients’ mean follow-up period was 12.7 months. Results: Nine patients required conversion to open surgery. There were no injuries to the nerves and tendons and no hematoma or incomplete dissection of the flexor retinaculum. The operative times varied between 11 and 34 minutes. We obtained the following results based on Kelly’s grading of outcomes: excellent in 116, good in 59, fair in 13, and poor in 3 patients. Conclusions: We found no patients with neurapraxia, major nerve injury, flexor tendon injury, superficial palmar arch injury, and hematoma. Although there was a learning curve associated with SRECTR, we performed 200 consecutive cases without neurovascular complications. This method may be a safe alternative to minimally invasive carpal tunnel surgery.

scholarly journals Ultrasonography Findings in Severe Carpal Tunnel Syndrome

Hand ◽  
2018 ◽  
Vol 15 (1) ◽  
pp. 64-68
Author(s):  
Gideon Nkrumah ◽  
Alan R. Blackburn ◽  
Robert J. Goitz ◽  
John R. Fowler
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Carpal Tunnel Release ◽  
Nerve Conduction Studies ◽  
Cross Sectional ◽  
Younger Patients ◽  
Tunnel Syndrome ◽  
Sensory Latency ◽  
Pisiform Bone

Background: Increasing severity of carpal tunnel syndrome (CTS), as graded by nerve conduction studies (NCS), has been demonstrated to predict the speed and completeness of recovery after carpal tunnel release (CTR). The purpose of this study is to compare the cross-sectional area (CSA) of the median nerve in patients with severe and nonsevere CTS as defined by NCS. Methods: Ultrasound CSA measurements were taken at the carpal tunnel inlet at the level of the pisiform bone by a hand fellowship–trained orthopedic surgeon. Severe CTS on NCS was defined as no response for the distal motor latency (DML) and/or distal sensory latency (DSL). Results: A total of 274 wrists were enrolled in the study. The median age was 51 years (range: 18-90 years), and 72.6% of wrists were from female patients. CSA of median nerve and age were comparatively the best predictors of severity using a linear regression model and receiver operator curves. Using cutoff of 12 mm2 for severe CTS, the sensitivity and specificity are 37.5% and 81.9%, respectively. Conclusions: Ultrasound can be used to grade severity in younger patients (<65 years) with a CTS-6 score of >12.

scholarly journals Postoperative diagnostic potentials of median nerve strain and applied pressure measurement after carpal tunnel release

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Yuichi Yoshii ◽  
Wen-lin Tung ◽  
Hiroshi Yuine ◽  
Tomoo Ishii
Keyword(s):  
Median Nerve ◽  
Carpal Tunnel ◽  
Operating Characteristic ◽  
Carpal Tunnel Release ◽  
Applied Pressure ◽  
Strain Ratio ◽  
Cross Sectional ◽  
Receiver Operating Characteristic Curves ◽  
Clinical Recovery ◽  
Open Carpal Tunnel Release

Abstract Bakground The objective of this study is to investigate the prognostic values of median nerve strain and applied pressure measurement for the assessment of clinical recovery after carpal tunnel release. Methods Forty-five wrists, from 45 idiopathic carpal tunnel syndrome patients who treated with open carpal tunnel release, were evaluated by ultrasound. Median nerve strain, pressure applied to the skin, and ratio of pressure-strain were measured at the proximal part of the carpal tunnel. In addition, distal latencies in the motor and sensory nerve conductions studies and cross-sectional area of median nerve were measured. The parameters were compared before and after the open carpal tunnel release. According to patient recovery, the receiver operating characteristic curves were generated to evaluate the prognostic values of the parameters. The areas under the receiver operating characteristic curves were compared among parameters. Results There was a significant increase in the median nerve strain, and significant decreases in the pressure applied to the skin and ratio of pressure-strain after carpal tunnel release (P < 0.01). There were significant decreases in the distal latencies and the cross-sectional area after carpal tunnel release (P < 0.01). The areas under the curves were 0.689, 0.773, 0.811, 0.668, 0.637, and 0.562 for the pressure, strain, pressure-strain ratio, motor latency, sensory latency, and area, respectively. Conclusions The results suggest that elasticity of the median nerve and pressure around the nerve recover quickly after carpal tunnel release. Pressure-strain ratio was the most reliable parameter to reflect clinical recovery. The measurement of strain and applied pressure can be useful indicators to evaluate effectiveness of the carpal tunnel release. Trial registration Registered as NCT04027998 at ClinicalTrials.gov. Retrospectively registered on July 22, 2019.

ENDOSCOPIC CARPAL TUNNEL RELEASE FOR RECURRENT CARPAL TUNNEL SYNDROME AFTER PREVIOUS OPEN RELEASE

Hand Surgery ◽  
2004 ◽  
Vol 09 (02) ◽  
pp. 235-239 ◽  
Author(s):  
Lam Chuan Teoh ◽  
Puay Ling Tan
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Carpal Tunnel Release ◽  
Open Release ◽  
Endoscopic Carpal Tunnel Release ◽  
Endoscopic Release ◽  
Tunnel Syndrome ◽  
Open Carpal Tunnel Release ◽  
Surgical Release

Recurrent carpal tunnel syndrome from various causes has been shown to occur in up to 19% of patients. Endoscopic carpal tunnel release has been used to decompress the median nerve in carpal tunnel syndrome for many years. However, endoscopic release for recurrent carpal tunnel syndrome after previous surgical release has not been reported. Nine hands in six patients had recurrent carpal tunnel syndrome five to 20 years after previous open carpal tunnel release. All the cases were successfully treated with endoscopic release.

Morphologic Analysis of the Carpal Tunnel and Median Nerve Following Open and Endoscopic Carpal Tunnel Release

Hand ◽  
2019 ◽  
pp. 155894471986171 ◽  
Author(s):  
Blair R. Peters ◽  
Amanda M. Martin ◽  
Brett F. Memauri ◽  
Hardy W. Bock ◽  
Robert B. Turner ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Median Nerve ◽  
Carpal Tunnel ◽  
Carpal Tunnel Release ◽  
Resonance Imaging ◽  
Open Release ◽  
Endoscopic Carpal Tunnel Release ◽  
Endoscopic Release ◽  
Significant Difference

Background: Endoscopic carpal tunnel release (ECTR) has purported advantages over open release such as reduced intraoperative dissection and trauma and more rapid recovery. Endoscopic carpal tunnel release has been shown to have comparable outcomes to open release, but open release is considered easier and safer to perform. Previous studies have demonstrated an increase in carpal tunnel volume, regardless of the technique used. However, the mechanism by which this volumetric increase occurs has been debated. Our study will determine through magnetic resonance imaging (MRI) analysis the morphologic changes that occur in both open carpal tunnel release (OCTR) and ECTR, thereby clarifying any morphologic differences that occur as a result of the 2 operative techniques. We hypothesize that there will be no morphologic differences between the 2 techniques. Methods: This was a prospective study to compare the postoperative anatomy of both techniques with MRI. Nineteen patients with clinical and nerve conduction study–confirmed carpal tunnel syndrome underwent either open or endoscopic release. Magnetic resonance imaging was performed preoperatively and 6 months postoperatively in all patients to examine the volume of the carpal tunnel, transverse distance, anteroposterior (AP) distance, divergence of tendons, and Guyon’s canal transverse and AP distance. Results: There was no significant difference in the postoperative morphology of the carpal tunnel and median nerve between OCTR and ECTR at 6-month follow-up on MRI. Conclusion: We conclude that there are no morphologic differences in OCTR and ECTR. It is an increase in the AP dimension that appears to be responsible for the increase in the volume of the carpal tunnel.

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